Mithqal
A unit of weight, equivalent to a little over 3 1/2 grammes,
used in the Kitáb-i-Aqdas with reference to quantities of
gold or silver for various purposes, usually in amounts of 9,
19 or 95 mithqals. The equivalents of these in the metric
system and in troy ounces (which are used in the
measurement of precious metals), are as follows:
9 mithqals = 32.775 grammes = 1.05374 troy ounces
19 mithqals = 69.192 grammes = 2.22456 troy ounces
95 mithqals = 345.958 grammes = 11.12282 troy ounces
This computation is based on the guidance of Shoghi
Effendi, conveyed in a letter written on his behalf, which
states "one mithqal consists of nineteen nakhuds. The
weight of twenty-four nakhuds equals four and three-fifths
grammes. Calculations may be made on this basis." The
mithqal traditionally used in the Middle East had consisted
of 24 nakhuds but in the Bayan this was changed to 19
nakhuds and Bahá'u'lláh confirmed this as the size of the
mithqal referred to in the Bahá'à laws (Q and A 23).
(Baha'u'llah, The Kitab-i-Aqdas p. 253)